Flash Furniture Gray Fabric Drafting Chair (Cylinders: 22.5''-27''H or 26''-30.5''H) Contemporary Draft Stool Mid-Back Design Gray Fabric Upholstery Back Depth Adjustment Knob Accordion Back Cover Contoured Seat and Back Swivel Seat Pneumatic Seat Height Adjustment Two Seat Height Ranges with Gas Cylinder Height Extenders Cylinder Heights: 22.5'' - 27'' or 26'' - 30.5''H